Proper grammar is important, whether you write for a living or only occasionally. It's especially important if you're looking for a job or trying to impress a new client. In this infographic, GrammarCheck has collected a list of some of the most common grammar errors people make and how to avoid them.

If you misuse a comma or mix up "your and you're," don't expect to get hired by …
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It's not a pretty graphic, but the information is valuable. Citing grammar-checking service Grammarly, the graphic shows that the most common errors are simple spelling mistakes (something easily fixed with a quick spell check). The next three most common mistakes, however, deal with missing commas, incomplete thoughts, and missing verbs.

In GrammarCheck's top 10 list, comma errors account for five of the top mistakes, and other punctuation mistakes also fill out the top 10. Here's the whole graphic (click to expand, right-click to save):